/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Nam Nguyen
 */

package redoak.php.bz2;

import java.io.IOException;
import java.io.OutputStream;

import redoak.php.bz2.impl.CBZip2OutputStream;

import com.caucho.quercus.QuercusModuleException;
import com.caucho.quercus.lib.file.AbstractBinaryOutput;

/**
 * As opposed to java's GZIPOutputStream, this class allows for more control on
 * what is written to the underlying OutputStream. 
 *
 * @see java.util.zip.GZIPOutputStream
 */
public class Bz2StreamOutputStream extends AbstractBinaryOutput {
	private OutputStream _os;
	private CBZip2OutputStream _out;

	private long _inputSize;

	/**
	 * @param out
	 * @param compressionLevel
	 * @param strategy Deflate compression strategy
	 * @param encodingMode FORCE_GZIP to write gzwrite compatible output;
	 *    FORCE_DEFLATE to write gzip header and zlib header, but do not
	 *    write crc32 trailer
	 */
	public Bz2StreamOutputStream(OutputStream os,
			int compressionLevel)
	throws IOException
	{
		_os = os;
		_out = new CBZip2OutputStream(_os, compressionLevel);
	}

	/**
	 * @param out
	 */
	public Bz2StreamOutputStream(OutputStream os)
	throws IOException
	{
		this(os,500);
	}

	/**
	 * Writes a byte.
	 *
	 * @param input
	 */
	public void write(int v)
	throws IOException
	{
		_out.write(v);

		_inputSize++;

	}

	/**
	 * @param input
	 * @param offset
	 * @param length
	 */
	public void write(byte[] buffer, int offset, int length)
	throws IOException
	{
		_out.write(buffer, offset, length);

		_inputSize += length;

	}

	public void flush()throws IOException
	{
		_out.flush();
	}

	public void closeWrite()
	{
		close();
	}

	public void close()
	{
		try {
			_out.close();
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * Returns false always for a write stream.
	 */
	public boolean isEOF()
	{
		return false;
	}

	/**
	 * Tells the position in the gzip stream
	 */
	public long getPosition()
	{
		return _inputSize;
	}

	/**
	 * Sets the position.
	 */
	public boolean setPosition(long offset)
	{
		if (offset < _inputSize)
			return false;

		offset -= _inputSize;
		byte[] buffer = new byte[128];

		try {
			while (offset > 0) {
				int sublen = (int)Math.min(offset, buffer.length);
				write(buffer, 0, sublen);
				offset -= sublen;
			}

			return true;
		} catch (IOException e) {
			throw new QuercusModuleException(e);
		}
	}

	public String toString()
	{
		return "Bz2OutputStream[]";
	}
}
